畢業(yè)論文-基于stc89c52單片機(jī)的智能音樂(lè)演奏器設(shè)計(jì)-資料下載頁(yè)

【導(dǎo)讀】隨著人們現(xiàn)代化水平的提高，科技產(chǎn)業(yè)發(fā)揮著舉足輕重的作用。術(shù)由于其實(shí)用性廣、成本低廉被廣泛發(fā)展及運(yùn)用。單片機(jī)技術(shù)是新興技術(shù)的核心。要素，正被人們廣泛關(guān)注，因此它的發(fā)展前景很寬廣。性及開發(fā)周期短等優(yōu)點(diǎn)，單片機(jī)的設(shè)計(jì)也越來(lái)越廣泛。所設(shè)計(jì)的智能音樂(lè)演奏器，該播放器可以讀取外置存儲(chǔ)設(shè)備，對(duì)存儲(chǔ)設(shè)備內(nèi)的音頻文件進(jìn)行讀取及。按鍵控制功能也是本設(shè)計(jì)的一大功能，設(shè)置相應(yīng)按。鍵來(lái)控制選歌、播放和停止。

　　

【正文】 [11] Jesu180。 s ,BeatrizBarros. A new cloud puting architecture for music position[J]. Journal of Network and Computer Applications,36 (2020) 429– 443. [12] D. Stowell , , of live human– puter musicmaking: Quantitative and qualitative approaches[J].Int. J. HumanComputer Studies,67 (2020) 960– 975 . 寧波大學(xué)信息學(xué)院本科畢業(yè)設(shè)計(jì)（論文） 31 致 謝 令人難忘的大學(xué)兩年本科階段即將結(jié)束，通過(guò)這次對(duì)所有知識(shí)的整理和梳理，我發(fā)現(xiàn)我是多么的乏力。主要原因還是在于對(duì)知識(shí)的中和整理及分析。在此，我對(duì) 所有幫助我及關(guān)心我的同學(xué)和老師表示感謝，是他們讓我能夠把知識(shí)靈活運(yùn)用，使我能透過(guò)理論看到本質(zhì)。謝謝，衷心的謝謝。在這里，我特別感謝張衛(wèi)強(qiáng)老師對(duì)我寫作及理論分析給予指導(dǎo)，感謝我的學(xué)長(zhǎng)學(xué)姐對(duì)我的點(diǎn)播，這都讓我受益匪淺。從中，我可以得知知識(shí)的重要性以及本專業(yè)對(duì)社會(huì)的貢獻(xiàn)度。我很感謝我的朋友以及老師、學(xué)長(zhǎng)們諄諄教誨。我知足了，因?yàn)樗麄兊南ば闹笇?dǎo)，我才可以給大學(xué)畫上完美的句號(hào)。謝謝你們，由于我渴望成功，由于我胸懷理想，由于我視大學(xué)為轉(zhuǎn)折點(diǎn)，所以我很努力在追求自己的生活，我定不會(huì)辜負(fù)你們的期望，在社會(huì)上好好運(yùn)用知識(shí)給人 們生活創(chuàng)造精彩！ 智能音樂(lè)演奏器設(shè)計(jì) 32 附 錄 附錄 1：系統(tǒng)原理圖 寧波大學(xué)信息學(xué)院本科畢業(yè)設(shè)計(jì)（論文） 33 附錄 2：系統(tǒng)程序 include //頭文件 include include include define uint unsigned int define uchar unsigned char sbit key1=P1^3。 sbit key2=P1^5。 sbit key3=P1^4。 sbit key4=P1^6。 sbit stop=P3^3。 uchar Num=0。 uchar AllNum=5。 uchar tnct。 bit startflag=0。 uchar code tab_led[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf}。 uchar getkey() { if(key1==0) { Delay_ms(15)。 if(key1==0) { while(!key1)。 return 1。 } } if(key2==0) { 智能音樂(lè)演奏器設(shè)計(jì) 34 Delay_ms(15)。 if(key2==0) { while(!key2)。 return 2。 } } if(key3==0) { Delay_ms(15)。 if(key3==0) { while(!key3)。 return 3。 } } if(key4==0) { Delay_ms(15)。 if(key4==0) { while(!key4)。 return 4。 } } return 0。 } void display() { lcd_w(0x80)。 寧波大學(xué)信息學(xué)院本科畢業(yè)設(shè)計(jì)（論文） 35 if(busy)//正在播放中 { lcd_wstr(tab[Num])。 P2=tab_led[tnct/3]。 } else { lcd_w(0x80)。 lcd_wstr(You Are Wele!)。 lcd_w(0x80+0x40)。 lcd_wstr( )。 if(startflag) { Num++。 if(Num==6) Num=0。 bofang(Num)。 } P2=0xff。 } } void T0_Init() { TMOD|=0x01。 TH0=(6553646080)/256。 TL0=(6553646080)%256。 EA=1。 TR0=1。 ET0=1。 } 智能音樂(lè)演奏器設(shè)計(jì) 36 void main ( ) { lcd_init()。 T0_Init()。 while(1) { switch(getkey()) { case 1:startflag=1。bofang(Num)。break。 case 2:stop=0。Delay_ms(30)。stop=1。startflag=0。break。 case 3:Num。if(Num==255)Num=AllNum。bofang(Num)。break。 case 4:Num++。if(Num==6)Num=0。bofang(Num)。break。 } display()。 } } void timer0() interrupt 1 { TH0=(6553646080)/256。 TL0=(6553646080)%256。 tnct++。 if(tnct==18) tnct=0。 } 寧波大學(xué)信息學(xué)院本科畢業(yè)設(shè)計(jì)（論文） 37 請(qǐng)刪除以下內(nèi)容， O(∩ _∩ )O謝謝！！！ The origin of taxation in the United States can be traced to the time when the colonists were heavily taxed by Great Britain on everything from tea to legal and business documents that were required by the Stamp Tax. The colonists39。 disdain for this taxation without representation (socalled because the colonies had no voice in the establishment of the taxes) gave rise to revolts such as the Boston Tea Party. However, even after the Revolutionary War and the adoption of the . Constitution, the main source of revenue for the newly created states was money received from customs and excise taxes on items such as carriages, sugar, whiskey, and snuff. Ine tax first appeared in the United States in 1862, during the Civil War. At that time only about one percent of the population was required to pay the tax. A flatrate ine tax was imposed in 1867. The ine tax was repealed in its entirety in 1872. Ine tax was a rallying point for the Populist party in 1892, and had enough support two years later that Congress passed the Ine Tax Act of 1894. The tax at that time was two percent on individual ines in excess of $4,000, which meant that it reached only the wealthiest members of the population. The Supreme Court struck down the tax, holding that it violated the constitutional requirement that direct taxes be apportioned among the states by population (pollock v. farmers39。 loan amp。 trust, 158 . 601, 15 S. Ct. 912, 39 L. Ed. 1108 [1895]). After many years of debate and promise, the sixteenth amendment to the Constitution was ratified in 1913, providing Congress with the power to lay and collect taxes on ine without apportionment among the states. The objectives of the ine tax were the equitable distribution of the tax burden and the raising of revenue. Since 1913 the . ine tax system has bee very plex. In 1913 the ine tax laws were contained in eighteen pages of legislation。 the explanation of the tax reform act of 1986 was more than thirteen hundred pages long (Pub. L. 99514, Oct. 22, 1986, 100 Stat. 2085). Commerce Clearing House, a publisher of tax information, released a version of the Internal Revenue Code in the early 1990s that was four times thicker than its version in 1953. Changes to the tax laws often reflect the times. The flat tax of 1913 was later replaced with a graduated tax. After the United States entered world war i, the War Revenue Act of 1917 imposed a maximum tax rate for individuals of 67 percent, pared with a rate of 13 percent in 1916. In 1924 Secretary of the Treasury Andrew W. Mellon, speaking to Congress about the high level of taxation, stated, The present system is a failure. It was an emergency measure, adopted under the pressure of war necessity and not to be counted upon as a permanent part of our revenue structure…. The high rates put pressure on taxpayers to reduce their taxable ine, tend to destroy individual initiative and enterprise, and seriously impede the development of productive business…. Ways will always be found to avoid taxes so des